Bony fish are members of the class osteichthyes, and are defined by their calcified skeleton, hinged jaw, gill arches, gill filaments, and gill rakers. They also have an operculum for pumping water across the gills and swim bladders to control buoyancy, as well as mucous-lined scales.
Consequently, what are the main characteristics of osteichthyes?
Key features of Osteichthyes
Skeleton more or less bony, vertebrae numerous.
Skin with mucous glands and embedded dermal scales.
some without scales.
Mouth with many teeth (some toothless).
Respiration by gills supported by bony gill arches and covered by a operculum.
What are the main characteristics of amphibians?
Many amphibians, such as frogs, undergo a metamorphosis, meaning they begin life in the water and live on land as adults. Defining characteristics of these creatures include moist, scaleless skin and the fact that they are cold-blooded. Amphibians absorb water and undergo gas exchange through their skin.
What is the class of osteichthyes?
Class Osteichthyes includes all bony fishes. Like all fishes, Osteichthyes are cold-blooded vertebrates that breathe through gills and use fins for swimming. Bony fishes share several distinguishing features: a skeleton of bone, scales, paired fins, one pair of gill openings, jaws, and paired nostrils.
What are the characteristics of a cartilaginous fish?
Other characteristics of cartilaginous fish include:
Skeletons made of cartilage rather than bone. Cartilage is supportive tissue that does not have as much calcium as bones, which makes bones rigid. Cartilage is softer and more flexible than bone.
What are the characteristic of bony fish?
Other Characteristics of Bony Fish. Both bony fish and cartilaginous fish breathe through gills, but bony fish also have a hard, bony plate covering their gills. This feature is called an operculum. Bony fish may also have distinct rays, or spines, in their fins.
What are the scales in bony fish made of?
Cartilaginous fishes (sharks and rays) are covered with placoid scales. Most bony fishes are covered with the cycloid scales of salmon and carp, or the ctenoid scales of perch, or the ganoid scales of sturgeons and gars. Some species are covered instead by scutes, and others have no outer covering on the skin.
What are the characteristics of a jawless fish?
Key Features of Agnatha
Jaws are absent.
Paired fins are generally absent.
Early species had heavy bony scales and plates in their skin, but these are not present in living species.
In most cases the skeleton is cartilaginous.
The embryonic notochord persists in the adult.
Seven or more paired gill pouches are present.
How do bony fish reproduction?
The majority of bony fish reproduce via external fertilization of their eggs. During spawning season for the fish, the females and the males release hundreds and sometimes thousands of eggs and sperm into the water. The eggs are fertilized in the water.
How many species are in chondrichthyes?
Chondrichthyes – Rays, Sharks, Skates, Chimaeras. There are around 1,000 species in this class of fish. The species in this class have a flexible skeleton made of cartilage instead of bone.
Do bony fish have swim bladder?
The swim bladder, gas bladder, fish maw or air bladder is an internal gas-filled organ that contributes to the ability of many bony fish (but not cartilaginous fish) to control their buoyancy, and thus to stay at their current water depth without having to waste energy in swimming.
How do bony fish regulate their buoyancy?
“Bony fish achieve neutral buoyancy through an air filled sac called the swim bladder. The swim bladder controls the fish’s buoyancy by varying the gas pressure inside the fish’s body to allow it to sink or rise in the water.” Cartilaginous fish (sharks, rays) do not have swim bladders.
Is a tuna fish a bony fish?
Fish are a very diverse group and live throughout fresh and salt water habitats. There actually two major groups of fishes: Cartilaginous Fishes (including sharks, skates, and rays), and Bony Fishes (like tuna, salmon, and carp).
What is the meaning of osteichthyes?
Osteichthyes (/ˌ?stiˈ?kθiiːz/), popularly referred to as the bony fish, is a diverse taxonomic group of fish that have skeletons primarily composed of bone tissue, as opposed to cartilage.
What is the class chondrichthyes?
Chondrichthyes (/k?nˈdr?kθiiːz/; from Greek χονδρ- chondr- ‘cartilage’, ?χθύς ichthys ‘fish’) is a class that contains the cartilaginous fishes: they are jawed vertebrates with paired fins, paired nares, scales, a heart with its chambers in series, and skeletons made of cartilage rather than bone.
Do bony fish have a vertebral column?
The skeleton of the fish is either made of cartilage (cartilaginous fishes) or bones (bony fishes). The main features of the fish, the fins, are bony fin rays and, except for the caudal fin, have no direct connection with the spine. They are supported only by the muscles. The ribs attach to the spine.
How do osteichthyes eat?
As a group, bony fishes can eat all sizes of plants and animals, from microscopic plant plankton to some of the largest marine animals.Some of the animals common in the diets of bony fishes include: annelid worms, marine snails, mussels, clams, squids, crustaceans, insects, birds, amphibians, small mammals, and other
Why fish are important?
Fish play an important role in nutrient cycles because they store a large proportion of ecosystem nutrients in their tissues, transport nutrients farther than other aquatic animals and excrete nutrients in dissolved forms that are readily available to primary producers. roles in nutrient recycling.
What does the esophagus of a fish do?
Esophagus: part of the digestive tract connecting the mouth to the stomach. Dorsal aorta: vessel in the back that carries blood from the heart to the organs. Stomach: part of the digestive tract between the esophagus and the intestine. Tooth: hard organ of a fish used to shred food.
Are bony fish vertebrates or invertebrates?
There are a few groups of chordates that do not possess a backbone (these organisms are not vertebrates and are instead referred to as invertebrate chordates). The animal classes that are vertebrates include: Jawless fish (Class Agnatha) Bony fish (Class Osteichthyes)
How many gills are there in a bony fish?
The bony fish have three pairs of arches, cartilaginous fish have five to seven pairs, while the primitive jawless fish have seven. The vertebrate ancestor no doubt had more arches, as some of their chordate relatives have more than 50 pairs of gills.
What is the purpose of the operculum?
In animals (other than humans), the operculum refers to different structures with different functions. In fish, the operculum is a bony flap covering the gills. It moves back and forth to move water over the gills, allowing the fish to breathe, and also serves as protection against these sensitive parts of the fish.
Is the eel a bony fish?
Cartilaginous fish include sharks, rays, skates and chimaeras (ghost sharks). Bony fish (also known as Ray-finned fish) are the largest of the three groups of fish with almost 27,000 species such as salmon, trout, lanternfish, cavefish, cods, anglerfish, tarpon, herrings, electric eels and many more.